Adjusting device for plate straightening machines



F. UNGERER ADJUSTING DEVICE FOR PLATE STRAIGHTENING MACHINES 5 Sheets-Sheet 1 April 25, 1933.

Filed Jan. 23, 1932 April 1933- F. UNGERER 1,905,530

ADJUSTING DEVICE FOR PLATE STRAIGHIENING MACHINES Filed Jan. 23, 1952 3 Sheets-Sheet 2 nun.)

y: l I I H April 25, 1933. UNGERER 1,905,530

ADJUSTING DEVICE FOR PLATE STRAIGHTENING MACHINES Filed Jan. 23, 1932 Q 5 Sheets-Sheet 3 OOOOOOGQOQOOOOO WWW 1 W Patented Apr. 25, 1933 UNITED STATES PATENT OFF-ICE FRITZ UNGEBER, OF PFORZHEII, GERMANY ADJUSTING DEVICE FOR PLATE STRAIGHTENING- MACHINES Application filed January 23, 1982, Serial No. 588,426, and in Germany January 81, 1981.

For straightening plates, it is known to alternately incline the upper row of straightening rollers together with the yoke and the straightening roller supportlng means towards both sides of the passage direction so that the imaginary plane extending through the axes of the rows of straightening rollers form an acute angle in the passage direction, the apex of this angle being directed towards the feed side.

This arrangement has been improved 1n that, by changing the direction of rotatlon of the upper straightening rollers, the lIlCllnation of the row of straightening rollers is automatically reversed. For this purpose a pinion is driven through the intermediary of a. friction clutch from one of the upper straightening rollers, said pinion engaging through the intermediary of a cam with a toothed segment oscillating the'yoke. TlllS construction has however been abandoned, as amongst other things the friction clutch between the straightening rollers and the pinion did not prove to be a continually reliable means for oscillating the heavy yoke.

Finally the one sided oscillating drive of the yoke has been replaced by a central drive in such a manner that elastic twisting of the yoke body is avoided.

This invention relates to a further improvement of this type of adjusting device. The novelty consists in the arrangement of an accessory motor which effects the adjustment of the inclination of the rows of straightening rollers by oscillating a'yoke, carrying a row of straightening rollers, whereas the turning movement of the straightening rollers is effected in known 40 manner by the main motor. 7

An embodiment of the invention is illustrated by way of example in the accompanying drawings, in which Fig. 1 shows the plate straightening mat5 chine in front elevation.

Fig. 2 is a side elevation of Fig. 1. Fig. 3 is a section on line 3-3 of Fig. 1. Fig. 4 shows in a front elevation partly in section on line 44 of Fig. 5 the switch mechanism after removal of the box cover.

chines, are however not transmitted of the hollow box-shaped yoke c which is carried on each side by a ide roller (1 journalled in. a. transverse e ement d (Fig. 3), said roller running on a steel race (Z of the yoke 0. The curvature of the steel race d corresponds to an are around a point (1 situ- 55 ated in alignment with the centres of the journal holes a The transverse element (1 is suspended by means of rods d, to a transverse bar k, which is supported on the side frames 72, of the machine. 'On the ridge of the yoke 0 vertical guides a are arranged on brackets 0 on which the cam 0 keyed on a shaft 0 acts, pressing towards the right and left during the oscillating movements. The shaft 0 is journalled on the under side of the transverse bar It and carries on one end a control lever 0 keyed thereon together with a reversing switch 2' and two loose adjusting levers c and 0 which can be fixed in any desired position on an arc-shaped element 0 A graduation on the element 0 makes itpossible to impart, by simply setting the control levers 0., and 0,, any desired angle of inclination rel ative to the row of straightening rollers 15 to the yoke c and to the row of straightening rollers 11 journaled therein. The oscillations of the yoke e, which is a very heavy body in the case of large plate stra'ghte maectly by hand by the operator, but by a separate oscillating motor f through the intermediary of worm f and a worm wheel section f keyed on the other outer end of the cam shaft 0 The wiring diagram illustrated in Fig. 6 is so arranged that, at the commencement of 95 the automatic adjusting of the inclination of the rows of straightening rollers by means of the oscillating motor f, the main motor g, imparting the actual rotary drive to the straightening rollers a and b, joined to the mo net, and the armature circuit of the main motor can be shorted during the inclined adjustment, at the same time cutting out resistances. The control cylinder 1) is illustrated I indeveloped condition and comprises two mg of the relay switch 3 as R is connected to w and W and moreover the outer phase T is connected to U and U the brake magnet g of the oscillatable motor f and this motor itself are connected to the three-phase system R S T. By removing the brake magnet g, the oscillatable motor f is liberated, so that it can immediately rotate and thus oscillate the yoke 0. This oscillation ceases only at the instant the relay m drops ofi again, that is when the relay switch 3/ is opened. However the relay coil must be deprived of current, andthis is effected automatically in that at the instant at which the inclination of the yoke 0 previously adjusted with the aid of the adjusting levers 0 and 0 is reached, the

change-over switch z fixed on the cam shaft- 0 oscillates past and under the slidable element m of the adjusting lever 0 so that the projecting button '5 is depressed, the circuit 6 interrupted and the relay coil consequently 1 cut out.

The greater the angle formed by the adjusting lever 0 with the vertical is, the greater will be the oscillation carried out by the yoke 0, as the oscillating drive effected by the motor 7 only ceases the instant the motor f comes to a standstill under the action of a brake weight 9 after the opening of the relay switch 3 o By further turning the control cylinder 1) into the positions 2 to 5, which may be effected during the adjustment of the inclination of the yoke c, continually more resist ances are cut out in the armature circuit of the main motor g, the stator of which has already been oined to the net with the oscillatable motor 7. When the position 5 is reached, the rotor is short-circuited and attains its maximum speed of rotation.

Ifthe control cylinder 1) is turned into the position 1 of the left half of the cylinder, the phase R is brought into connection with the middle phase S through the intermediary of the wire 6 leading through the change-over switch z' and of the coil of the relay m. The switch 3 actuated by the relay m is thus again closed. Consequently, the relay m lies between the outer phase B and the middle phase S.

The connection of the wire e to the coil of the relay m is established the instant the button i is depressed by means of the slidable element 02 and thereby the connection of the wlre 6 to the coil of the relay m is broken.

7 The change-over switch i is therefore so constructed that, when owing to the depression of one of the buttons 5 or the relay circuit (R S) established by the bars of one half of the control cylinder is-broken, the relay circult (R S) reestablished subsequently by the bars of the other halves of the control cylinder is closed.

The closing of the relay switch y through the wire e causes the brake magnet g of the oscillatable motor 7 and the motor itself to be connected to the three-phase system R S T, but this time in the opposite direction, as R is connected to U and moreover the outer phase T is connected to W The oscillation of the yoke 0 then commencing will terminate when the change-over switch i together with the button 2' passes under the slidable element m of the adjusting lever 0 If it is desired to retain the two rows of straightening rollers a and b in a certain po sition, for example parallel the one to the other, for several passes of the work, the relay circuit is interrupted by opening the switch k, so that the oscillatable motor f can no longer become operative.

The parts of the change over switch 2', as shown in Figs. 4 and 5, are accommodated in a box i with lid 5 It is suspended on a lever 0 in the channelo of which the feed wires are arranged. These wires pass through an aperture 2' into the interior of the box and are connected to the pairs of opposite contacts z, by means of terminals i Each pair of contacts i, can be interconnected by means of the oscillatable element 2' for which purpose this element has a bore i in which two caps 2' sliding between the walls i are pressed outwardly by a spring and thus close a relay circuit the instant they come into contact with the oppositely situated contacts 2}. The oscillatable element i is hingedly connected to a further oscillatable element i mounted by means of a screw i in the box 2' The oscillatable element 2' is further suspended on a tension spring 2' engaging below the pivot point i which spring determines the two extreme positions of the two oscillatable elements 2' and in which positions the element i always suddenly switches over, in order to prevent sparking when braking and comes into contact with an abutment 13, The oscillation from one extreme position into the other is caused by the depression of the buttons 2' and '5 on the horns i of the oscillatable element 2' These buttons, as shown in Fig. 5, are mutually displaced, so that they do not lie in one and the per rolls a are lowered, the deeper they will As shown in Fig. 2, two rows of straightening rolls a and b are arranged superposed. The journals of the upper row of rolls a are mounted in the yoke 0, which can be oscillated around its longitudinal axis with the adjustin device'above described. In Figs. 2 and 3 t e yokec is adjusted so that the axes of the rolls a lie in a. horizontal plane. The yoke 0 can be raised and lowered according to the thickness of the plate. The more the upengage between the rolls 6. If a plate to be straightened is passed between the straightening rolls when the upper and lower rows are parallel, it will be found that the plate rolls in leaving the last pair of rolls, which 13 caused by the pairs of rolls en aglng too deeply. However, it is not desired to obtain a rolled plate as the result of the stra ghtening, but an absolutely flat straightened plate, from which the stresses have been completely removed by the treatment between the straightening rolls.

It has been found that the sheet metal plate no longer has a tendency to roll on leaving the machine if the interengagement of the pairs of rolls situated onthe point -at which the plate is delivered, is not as deep as would otherwise be necessary for obtaining a good straightening result. The disadvantage of the rolling or bending up of the edge of the plate is prevented if the yoke is inclined so that the straightening rolls interengage most deepl at the point at which the plate is fed into t e machine and least or not at all at the point at which the plate is delivered. Consequently, the rows of straightening rolls are set at an angle to one another, so that the apex of this angle is situated at the point at which the plate is fed into the-machine. The inclination of the rows of straightening rolls in the machine illustrated is attained solely by oscillating or tilting the yoke with the upper row of rolls so that the upper row of rolls no longer lies in a horizontal lane. The lower rowof straightening rolls is not inclined and consequently in the form of construction illustrated remains horizontal.

I claim 2- 1. A device for adjusting the mutual inclination of rows of straightening rollers of plate straightening machines, comprising in combination with the rows of straightening rollers, a main motor adapted to rotate said straightening rollers, a yoke carrying one of said rows'of rollers, and an auxiliary motor adapted to oscillate said yoke and consequently the row of rollers carried by said yoke,

and the button 11 with the trolled by whilst said rows of rollers are rotated by said main motor.-

2. A device as specified in claim 1, compr1s-- ing in combination with the yoke, the main motor and the auxiliary motor connected in parallel with said main motor, a control cylinder connected in parallel to motor adapted to simultaneously connect both of saidrmotors to the current net, an

armature of said main motor ada ted to be shorted by said control cylinder uring the oscillation of said yoke, adapted .to be cut out by said cylinder during the shorting of said main motor.

3. A device as specified in claim 1, comprising in combination with the yoke and the auxiliary motor, circuits of said auxiliary motor, a magnet brake of said motor, a switch adapted to open and close said circuits and to actuate said brake, a relay adapted to actuate said switch, a change-over switch consaid yoke connecting in parallel said auxiliary motor to said rela adapted to automatically break said circuits after a predetermined oscillation of said yoke, and a control cylinder adapted to to said change-over switch to mentioned switch.

4. A device as specified in claim 1, comprising in combination with the yoke, the main motor and the auxiliary motor, a cam adapted to oscillate said yoke, a shaft carrying said cam adapted to drive said cam, a worm gear mg adapted to impart the movement of said motor to said shaft, an oscillatable arm keyed on said shaft, a rela connected up in said auxiliary motor circuit, a control cylinder diyided into two halves, each half connected up in one of said circuits adapted to control said circuits, a change-over switch in said circuits carried by said arm adapted to switch said relay slidable elements in the path of oscillation of saidchange-over switch adapted to reversing switch, said reversing switch ada ted to close said main motor circuit opened by said control cylinder and to open said auxiliary motor circuit closed by said cylinder.

A device as specified in claim 1, comprising in combination with the main motor, the auxiliary motor and the yoke, a cam adapted to oscillate said yoke, a shaftcarried by said cam, a circuit of said main motor, a circuit of said auxiliary motor, a reversing switch connected'up in said circuits, adjusting levers loosely mounted on said shaft, guides carried by said levers adapted to control said switch and an arc-shaped element having notches adapted to fix the position of said guides.

6. A device as specified in claim 1, comprising in combination with the main motor, the auxiliary motor, a circuit of said main motor, a circuit of said auxiliary motor,a

close said first in and out, an arc-shaped element, and adjustable on said element come into contact with said said auxiliary and resistances supply current reversing switch connected up in said circuits, an upper oscillating element of said switch, a lower oscillating element, a pull spring connecting said oscillating element 5 engaging said lower element below the pivot oint and engaging said upper element at 1ts pivot point, said elements forming an elbow joint, abutments arranged one on each side of said lower elementand each connected in one of said circuits adapted to limit the oscillating movement of said lower oscil lating element, one of said circuits being closed by said elbow joint in each extreme position.

7. A device asspecified in claim 1, comprising in combination with the main motor and said auxiliary motor, a circuit of said main motor, a circuit of said auxiliary motor, a reversing switch connected up in said circuits, a casing of said switch, opposite contacts of said circuits arranged in pairs in the walls of said casing, an oscillating element having a bore of said switch adapted to connect said contacts in pairs, two slides shiftably mounted in said bore, and a spring between said slides adapted to press said slides outwards against the walls of said casing and against said pairs of contacts.

8. A device as specified in claim 1, comprising in combination with the main motor, the auxiliary motor and the oscillatable'yoke, a circuit of said main motor, a circuit of said auxiliary motor, a reversing switch in said circuits, an oscillating element of said switch,

two horns on said oscillating element, two press buttons arranged in difierent planes of oscillation one above each of said horns, and two guides oscillatable with said yoke one above each of said press buttons adapted to 40 depress one of said buttons during each direction of oscillation of said yoke, at each oscillating movement one of said horns adapted to raise the other of said buttons.

In testimony whereof I aflix my signature.

' FRITZ UNGERER. 

